K. Ravikumar et al., THE DIELS-ALDER REACTION-PRODUCT OF BETA-IONONE AND MALEIC-ANHYDRIDE, Acta crystallographica. Section C, Crystal structure communications, 51, 1995, pp. 449-451
The structure of the title compound, -oxobutyl)bicyclo[2.2.2]oct-5-ene
-2,3-dicarboxylic acid anhydride, C17H22O4, a Diels-Alder reaction pro
duct of beta-ionone and maleic anhydride, was solved by direct methods
. The three six-membered rings of the bicyclo[2.2.2]oct-5-ene cage all
slightly deviate from ideal boat conformations. The 3-oxobutyl side c
hain has an extended configuration.